Floor construction.



J. KAHN. FLOOR CONSTRUCTION. APPLIOATION E1n-ED OOT.17',.19'1O.

1,033,413;- Patented July 23, 1912.

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` J. KAHN. FLOOR CONSTRUCTION. APPLICATION FILED 0072.17, 1910.'

1 ,033,41 3. Patented July 23, 1912.

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` UNITED sTATEs PATENT CEEI'CE.

JULIUs KAIIN, or DETROIT, MICHIGAN, assIGNoB, To- TnUssEn CCNCEETE STEEL CCMIANL or DETROIT, MICHIGAN, A .CORPORATION oF MICHIGAN.

FLCOR CONSTRUCTION.' I

Specification of Letterslatent.

To all whom it 1mg concern:

Be it lmown that I, J ULIUs KAHN, a citizen of the United States, and a resident lof Detroit, in the county of Wayne and State of Michigan, have invented a new and Improved Floor Construction, of whichthe following is a specication.v

This construction relates to reinforcedconcrete floors, especially to ioors formed by joists or beams crossing each other, combined with continuous slabs, and the object of this invention is to provide forms or centers for supporting the concrete forming these slabs and to act as molds for the joists.

ThisY invention is embodied in pressed sh eet-metal forms or centers, preferably substantially rectangular, havingv corrugated sides. v

In the accompanying drawings, Figure 1 is a perspective showing a floor construction embodying this invention. Fig. 2 is --a plan of a sheet of metal properly cut to go to the forming die. `Fig. 3 is an elevation and Fig. 4.- is a bottom plan of a finished center. Fig. 5 is an elevation of a modified form of the same.

Similar reference characters refer to like parts throughout the several views.

Hollow terra-cotta tiles have been employed as molds, centers or illers to form hollows 0r air-spaces in reinforced concrete loors. withalarge measure of success. Where tiles can be procured at reasonable prices, such construction is probably one of the -most desirable yet devised. But the weight of the tiles and the resultant cost of shipping the same precludes their use at any great distance from the place where they are burned. The sheet metal centers shown in the drawings may be pressed at a single a'ction of a forming die and then Ashipped nested at a moderate cost. For centers twenty-four inchesv square at the bottom and from six to eight inches high, sheetV steel of No. 28 U. S. standard gage is usually sufficiently heavy. Before the sheet 1 (Fig. 2) is pressed, notches 2 maybe cut in opposite edges t0 receive the ribs of ribbed-metal-lath as shown in Fig. 1. The sheet is then pressed' to form a center 3, (Figs. 2 and3) the .cor-

rugations 4 in .the sides running from maxi- The sides of the centers, by reasonV of these corrugations, are of suiicient stiffness to carry the load of the'slab and of the workmen and their tools and barrows.

'When a floor is to be constructed, a false mum at the edges to. nothing at the top...

Patented Jury 23,1912.

Workis built and the centers are properly positioned; the concrete is placed between them to support the reinforcements, the reinforcements are positioned and the concrete filling completed. lVhen a iat ceiling is desired, as shown 'in Fig. 1, a metal-lath is. laid directly on the falsework.- The centers 3 are then'positioned, and if a ribbed-lath 5 is employed, thefribs 6 y will enter the Com' notches 2, thus alining the centers.

crete is placed inthe bottom ofthe spaces between the centers and reinforcing bars 7 -and 8 are laid thereon, after which the remainder of the concrete 9- is filled in and rolled down.

The metal centers 3 are preferable to tiles because the sides are all closed, admitting no concrete, and permitting reinforcement in both directions because concrete j'oists crossingeachother` are possible. This ideal reinforcement of a floor admits of the use ofmuch lighter metal. The 'concrete beams are laterally braced at frequent intervals and may therefore1 be quite light.' Asthe ioor 'slabs are supported by the forms or centers 3 and by crossed joist's, the thiclmess'can be reduced to a minimum, effecting great saving' of concrete and *producingl a very light floor. Usuallyv a squarev center or form is most desirable, but when oblong forms are desired, the construction shown inl Fig. 5

may be employed, two4 sections 12a I1d 13 being shown f constructed. with but. three sides 14, and with their open ends over-lapping. Because of the-corrugations, the two sections will berigidly united. f desired, the metal may be pressed to. form these oblong centers'of vany desired size, but the 'standard sizes willprobably all be square.

After theconcrete has set-,the falce-work may be removed and plaster 1'5 applied to 'the lower'surfacejof the metal lath. The

concrete at the bottom of the joists will How around the strandsl and-meshes ofthe ,lath andflock it firmly ,in place.

Having now explained my construction, what I claim as my invention and desire to secure by Letters Patent is :-v

In a Hoor-construction, the combination of a properly spaced series of rows of sheet metal members comprising rectangular tops and corrugated sides, the lower edges of two opposite sldes having notches, a sheet of eX- Ygenoleil metal extending below seid mem-- ers and formed with parallel ribs extencl ingwupwardly into the notches in the edges of the members and therebyl eliningi; the

members in prallel rows, and a body of eonv crete extending over andbetween themembers.

In testimony whereof I have signed this speciicationin the presence of two suloscrib ing witnesses.

f v- JULIUS' KAHN. Witnesses:

EDWARD N.` PAGELSEN, ELIZABETH M. BROWN. 

